CHEM1108 Example Multiple Choice Questions

Transcription

1 M08 xample Multiple hoice Questions The following multiple choice questions are provided to illustrate the type of questions used in this section of the paper and to provide you with extra practice. It is not a sample quiz. The questions in the paper will be in the style of these questions but may well cover different topics. In the exam, the answer should be indicated by clearly circling the letter next to the choice you make and by filling in the corresponding box on the computer-marked sheet provided. The marks for each correct answer are given beside each question. Instructions for use of the computer sheet. raw a thick line through the centre and crossing both edges of each box selected, as in this example. Use a dark lead pencil so that you can use an eraser if you make an error. rrors made in ink cannot be corrected you will need to ask the examination supervisor for another sheet. oxes with faint or incomplete lines or not completed in the prescribed manner may not be read. e sure to complete the SI and name sections of the sheet. Your answer as recorded on the sheet will be used in the event of any ambiguity. There is only one correct choice for each question. egative marks will not be awarded for any question.

2 M08 June 20 xample Multiple hoice Questions. Which one of the following molecules has a dipole moment? S 2 l 3 SF 6 l Which one of the following elements exhibits semi-metallic (metalloid) behaviour? r a Ge F Xe 3. What is the spatial arrangement of the valence shell electron pairs (σ and nonbonding) in the 3 ion? trigonal planar tetrahedral trigonal pyramidal bent square planar 4. What is the molecular geometry/shape of ammonia? tetrahedral trigonal pyramidal square planar octahedral linear 5. Which of the following elements has the lowest electronegativity? F r s l

3 M08 June 20 xample Multiple hoice Questions 6. Which of the following elements has the highest first ionisation energy? Li a K e 7. Which of the following elements has the smallest atomic radius? I l 8. Which one of the following sets of quantum numbers is valid? n l m l m s ½ 3 0 +½ +½ 2 2 ½ ½ 9. Rank the following series of atoms in order of IRSIG electronegativity. F P s < < F < P < s F < < < P < s s < P < < < F s < P < < F < F < < < s < P 0. What is the correct atomic symbol for an atom with 5 protons and 7 neutrons? 7 l 5 7 P 5 32 P 5 5 l 7 32 l 7

4 M08 June 20 xample Multiple hoice Questions. Which one of the following ions is used in the treatment of bipolar disorder? u + e 2+ Fe 2+ Zn 2+ Li + 2. The pk a of is 9.2. What is the K b of its conjugate base,? For questions 3-9, choose from - the term that best describes the overall mechanism of the reaction.. lectrophilic addition. xidation. limination. ucleophilic substitution. ucleophilic addition S 2 S S l r

5 M08 June 20 xample Multiple hoice Questions 8. r 9. For questions 20-24, choose from - the term that best describes the isomeric relationship for each of the following pairs of compounds.. nantiomers. Same compound. onstitutional isomers. iastereoisomers. onformational isomers (P) l (Q) 2 l ow many stereoisomers are there for the compound labelled (P) in question 23?

6 M08 June 20 xample Multiple hoice Questions 26. Give the stereochemical description of the compound labelled (Q) in question 24. a (Z)-isomer an (R)-enantiomer an achiral compound an (S)-enantiomer an ()-isomer In answering the questions 27-3 consider the six compounds () - (M). 2 () ibuprofen (I) histamine (J) paracetamol (K) procaine (L) atropine (M) prostaglandin 27. Which compounds, if any, will show effervescence (bubbling) when added to sodium hydrogencarbonate solution? 2 I, K and L only and M only J only one of them

7 M08 June 20 xample Multiple hoice Questions 28. Which compounds, if any, will react with cold dilute a? K only I, K and L only, J and M only one of them 29. Which compounds, if any, will dissolve in cold dilute l? I, K and L only I, J and K only and M only one of them 30. Which compounds will undergo an addition reaction with r 2 /l 4? and M only M only I only K and M only 3. Which compounds will undergo a reduction reaction with a 4? J only K only and M only K and M only 32. Which one of the following compounds is not aromatic? S

8 M08 June 20 xample Multiple hoice Questions nswers Question nswer Question nswer Question nswer Question 3 32 nswer